Chicago Marathon
Chicago, IL, USA • October 11, 2026
Race Day Weather
54°
66° high
Breezy
Dry
Cool start, variable winds ahead
Runners will face a temperature increase from 55°F at the start to 66°F by the finish, with humidity at 60%. Wind will shift from a tailwind to headwinds through various segments, peaking at 12 mph. Runners should prepare for tough stretches with headwinds from miles 2-14 and mile 21, while taking advantage of tailwinds from miles 1-2 and 24-27 for faster pacing.
Race day forecast available in 181 days
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Distance: 26.2mi
0:00:00
HH:MM:SS
The Chicago Marathon is a marathon (long-distance foot race) held every October in Chicago, Illinois. It is one of the six World Marathon Majors. Thus, it is also a World Athletics Label Road Race. The Chicago Marathon is the fourth-largest race by number of finishers worldwide. Wikipedia
FAQ
When is the 2026 Chicago Marathon?
The 2026 Chicago Marathon will be held on Sunday October 11, 2026.
Is the Chicago Marathon a Boston Marathon Qualifier?
Yes, the Chicago Marathon is an official Boston Marathon qualifier.
What will the weather be like for the 2026 Chicago Marathon?
The forecast calls for a high of 66°F and a low of 54°F with a 0% chance of rain.
Historical Weather
Based on 26 years of data
Avg Temp
64°F
L:51° H:64°
RunScore
Conditions
Rain Freq
12%
3 of 26 yrs
Wind11mph
Dew42°F
Temperature History
Range of temperatures during race hours for each year.
Detailed History
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